M688 Flip Chip Unibus Power Fail Driver Modules - test-drb@ccmp.vtda.org

8 Jan 2021

...
  From: Steven Malikoff 
...
  Would that be part of this system at a Japanese
computer museum? ...
 the 11/05 has 'Unichannel15' on it 
Yes, the 3 bays in the center are a PDP-15. (The indicator panel at the top
of the center bay is the one for the PDP-15 CPU; you can see it here:

  http://ana-3.lcs.mit.edu/~jnc/tech/DECIndicatorPanels.html

at the top of the 'PDP-15' section.) The Unichannel 15:

  https://gunkies.org/wiki/UNICHANNEL_15_System

is undoubtly there to drive the RK05; I don't think there's a native PDP-15
controller for that.

...
  There is an 11/15 
??? Is that a typo for 'PDP-15'? The -11/15 looks just like an -11/20

  https://www.ricomputermuseum.org/collections-gallery/equipment/dec-pdp-1115

except it only has 16 address switches, not 18 as on the /20. (The front panel
shown there has an OEM-specific re-paint; I couldn't quickly turn up an image
of a DEC /15 front panel.)

	Noel